Question

A hotel has 18 floors. The hotel owner believes the number 13 is unlucky. The first 12 floors are numbered from 1 to 12. Floor 13 is numbered 14, and the remaining floors are numbered from 15 to 19. The hotel manager starts on the top floor of the apartment building. He rides the elevator two floors down. The doors open and a hotel guest gets in. They ride the elevator three floors down. The hotel guest gets off the elevator. The hotel manager rides the elevator the remaining floors down to the first floor.
Write an addition expression using negative integers to show the number of floors the hotel manager rode down the elevator.

Answer 1

When the hotel manager rides down 2 floors from 19 floor, it means he stops at floor 17, the floor he rides down as negative integer = -2
then he rides down 3 floors and it means he stops at floor 14, so the number of floors he rides down from there = -3
then he rides to the first floor as there is no number 13 floor it means he rides down 12 floor = -12
the addition expression using negative integers to show the number of total floors the hotel manager rode down the elevator = -2 + (-3) + (-12) = -17